const mongoose = require('mongoose');
module.exports = new Promise((resolve,reject)=>{
    mongoose.connect('mongodb://localhost:27071/student_2203A',{
        useNewUrlParser:true,
        useUnifiedTOpology:true
    })
    mongoose.connection.once('open',err=>{
        if(!err){
            console.log('数据库连接成功');
            resolve();
        }else {
            console.log(err);
            reject(err);
        }
    })
})